win: Make MusicManagerPrivateTest.DeviceIdValueReturned work on swarming.

chrome/browser/extensions/api/music_manager_private/music_manager_private_browsertest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "extensions/test/extension_test_message_listener.h"
 
 // Supported on all platforms, but on Windows only if RLZ is enabled.
 #if !defined(OS_WIN) || defined(ENABLE_RLZ)
 
 class MusicManagerPrivateTest : public extensions::PlatformAppBrowserTest {
 };
 
 IN_PROC_BROWSER_TEST_F(MusicManagerPrivateTest, DeviceIdValueReturned) {
-#if defined(OS_MACOSX) || defined(OS_LINUX)
-  // Note: Some MacOS/Linux trybots seem to run under VMware, which assigns
-  //       MAC addresses that are blacklisted. We still want the test
-  //       to succeed in that case.
-  const char* custom_arg = "device_id_may_be_undefined";
-#else
-  const char* custom_arg = NULL;
-#endif
-  ASSERT_TRUE(RunPlatformAppTestWithArg(
-      "platform_apps/music_manager_private/device_id_value_returned",
-      custom_arg))
+  ASSERT_TRUE(RunPlatformAppTest(
+      "platform_apps/music_manager_private/device_id_value_returned"))
           << message_;
 }
 
 #endif